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Fireside Corrosion Behavior of HVOF and Plasma-Sprayed Coatings in Advanced Coal/Biomass Co-Fired Power Plants
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hussain, Tanvir M. E. Dudziak, Tomasz Simms, Nigel J. Nicholls, John Rayment |
| Copyright Year | 2013 |
| Abstract | This article presents a systematic evaluation of coatings for advanced fossil fuel plants and addresses fireside corrosion in coal/biomass-derived flue gases. A selection of four candidate coatings: alloy 625, NiCr, FeCrAl and NiCrAlY were deposited onto superheaters/reheaters alloy (T91) using high-velocity oxy-fuel (HVOF) and plasma spraying. A series of laboratory-based fireside corrosion exposures were carried out on these coated samples in furnaces under controlled atmosphere for 1000 h at 650 °C. The tests were carried out using the “deposit-recoat” test method to simulate the environment that was anticipated from air-firing 20 wt.% cereal co-product mixed with a UK coal. The exposures were carried out using a deposit containing Na2SO4, K2SO4, and Fe2O3 to produce alkali-iron tri-sulfates, which had been identified as the principal cause of fireside corrosion on superheaters/reheaters in pulverized coal-fired power plants. The exposed samples were examined in an ESEM with EDX analysis to characterize the damage. Pre- and post-exposure dimensional metrologies were used to quantify the metal damage in terms of metal loss distributions. The thermally sprayed coatings suffered significant corrosion attack from a combination of aggressive combustion gases and deposit mixtures. In this study, all the four plasma-sprayed coatings studied performed better than the HVOF-sprayed coatings because of a lower level of porosity. NiCr was found to be the best performing coating material with a median metal loss of ~87 μm (HVOF sprayed) and ~13 μm (plasma sprayed). In general, the median metal damage for coatings had the following ranking (in the descending order: most to the least damage): NiCrAlY > alloy 625 > FeCrAl > NiCr. |
| Starting Page | 797 |
| Ending Page | 807 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s11666-013-9887-x |
| Alternate Webpage(s) | https://www.nottingham.ac.uk/research/groups/cse/documents/peer-reviewed-journal-papers-2016/11-fireside-corrosion-behavior-of-hvof-and-plasma-sprayed-coatings-in-advanced-coal-biomass-co-fired-power-plants.pdf |
| Alternate Webpage(s) | https://doi.org/10.1007/s11666-013-9887-x |
| Volume Number | 22 |
| Journal | Journal of Thermal Spray Technology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
